Head rest



FIG. 1 is an exploded perspective view of a head rest showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is an end elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is an end elevational view thereof; and,

FIG. 6 is a top plan view thereof, the bottom being unadorned. 

The ornamental design for a head rest, as shown and described. 